Comment 2 for bug 1254738

The reason this issue has shown up on KitKat is that there is a whole bunch of new kernel messages being output form 'healthd' which occur at the same time the same serial port is being initialised for the Android console. This has shown up a race condition in the serial driver which the attached patch fixes. (Unfortunately there may still be other issues of a similar nature lurking.)

We would probably avoid tripping over this serial port issue if we could silence the 'healthd' battery messages , which look ugly anyway and occur every minute after boot.